CN116709467A

CN116709467A - Method and device for accessing communication network

Info

Publication number: CN116709467A
Application number: CN202210191759.7A
Authority: CN
Inventors: 李文正; 朱强华; 吴问付
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2023-09-05
Also published as: WO2023160199A1

Abstract

The application provides a method and a device for accessing a communication network. The method comprises the following steps: the method comprises the steps that a first mobile management network element (AMF) receives first information sent by terminal equipment, wherein the first information is used for indicating a first service requested by the terminal equipment; the first AMF determines first indication information according to a first service requested by the terminal equipment, a second service supported by a visiting place network and a third service supported by a home network, wherein the first indication information is used for indicating success or failure of PDU session establishment of the terminal equipment; the first AMF sends the first indication information to the terminal equipment, wherein the first AMF belongs to the visited network. By the method and the device, the terminal equipment can simultaneously use the service supported by the access network and the service supported by the home network, and the service requirement of the terminal equipment is ensured.

Description

Method and device for accessing communication network

Technical Field

The embodiment of the application relates to the field of communication, and more particularly relates to a method and a device for accessing a communication network.

Background

A non-public network (NPN) is a non-public 5G network that may be implemented by means of network functions of a public land mobile network (public land mobile network, PLMN), such as a public network integrated NPN (public network integrated NPN, PNI-NPN), or may be implemented independently of network functions of a PLMN, such as stand alone NPN (SNPN).

The SNPN network is deployed independently of the PLMN network, and the SNPN network is identified using a PLMN identifier (PLMN ID) and a network identifier (network identifier, NID). In the SNPN network, a cell thereof broadcasts a PLMN ID and a NID, and UE selects the SNPN network according to the broadcast information.

In the coverage area of some specific PLMN networks and NPN networks (such as stadiums, concerts, parks), the service network operators of the areas may provide specific services (services provided in specific scenarios, such as stadiums, concerts, parks) for User Equipment (UE) with specific service subscription information according to the service scenario requirements. When a UE having subscription information for a specific service enters the coverage area of the serving network, it is necessary to discover and select a network service that accesses the serving network providing the specific service to obtain the specific service.

Disclosure of Invention

The embodiment of the application provides a method for accessing a communication network, which can ensure the service requirement of terminal equipment.

In a first aspect, a method of accessing a communication network is provided. The method comprises the following steps: the method comprises the steps that a first mobile management network element (AMF) receives first information sent by terminal equipment, wherein the first information is used for indicating a first service requested by the terminal equipment; the first AMF determines first indication information according to a first service requested by the terminal equipment, a second service supported by a visiting place network and a third service supported by a home network, wherein the first indication information is used for indicating success or failure of establishment of a protocol data unit PDU session of the terminal equipment; the first AMF sends the first indication information to the terminal equipment, wherein the first AMF belongs to the visited network.

Based on the above scheme, the first AMF receives first information from the terminal device, where the first information is used to indicate a first service requested by the terminal device, the first AMF determines first indication information according to a second service supported by the access network, a third service supported by the home network, and the first service requested by the terminal device, the first AMF sends the determined first indication information to the terminal device, and the terminal device determines that establishment of the PDU session is successful or failed according to the first indication information. Taking the example that the first service requested by the terminal equipment belongs to the second service supported by the first access network equipment, the terminal equipment sends first information to the first AMF, the first information is used for indicating the first service requested by the terminal equipment, the first AMF judges according to the first information and the second service supported by the access network, and sends first indication information to the terminal equipment, wherein the first indication information indicates that PDU session establishment of the terminal equipment is successful. When the first service requested by the terminal equipment does not belong to the second service supported by the visited network, but the first service belongs to the third service supported by the home network, the first indication information indicates that PDU (protocol data unit) session establishment of the terminal equipment is successful, and the terminal equipment establishes an HR (session) session through the visited network, so that the home network is selected to complete the service requirement of the subsequent terminal equipment. The first AMF judges the service requested by the terminal equipment through the service supported by the visiting place network and the service supported by the home place network, so that the terminal equipment can access the service supported by the visiting place network and the service supported by the home place network at the same time in certain specific service networks, and the service requirement of the terminal equipment is ensured.

With reference to the first aspect, in certain implementation manners of the first aspect, the first AMF receives session establishment request information sent by a terminal device, where the session establishment request information includes a first service requested by the terminal device.

Based on the scheme, the terminal equipment sends the first service information carrying the request of the terminal equipment to the first AMF, so that the terminal equipment is ensured to select a proper access mode to access the network equipment, and the service requirement of the terminal equipment is met.

With reference to the first aspect, in certain implementation manners of the first aspect, the first AMF sends query service request information to the second AMF and/or the first AMF sends query service request information to a data management network element UDM, where the query service request information is used to query a third service supported by the home network, and the second AMF and the UDM belong to the home network.

Based on the above scheme, the first AMF queries the third service supported by the home network, the second AMF and/or the UDM send the third service supported by the home network to the first AMF according to the request of the first AMF, and the first AMF determines the second service and the third service to be the first indication information sent by the terminal device according to the first service, so that the service requirement of the terminal device can be guaranteed.

With reference to the first aspect, in certain implementation manners of the first aspect, before the first AMF sends the query service request information, the method further includes: the first AMF receives first registration request information from the terminal device, the first registration request information being used to request access to the visited network.

With reference to the first aspect, in some implementations of the first aspect, the first AMF receives service response information sent by the second AMF and/or the first AMF receives service response information sent by the UDM, where the service response information includes a third service supported by the home network.

With reference to the first aspect, in certain implementation manners of the first aspect, the first AMF sends first indication information to the terminal device, where the first indication information is used to indicate that the PDU session establishment of the terminal device is successful.

With reference to the first aspect, in certain implementations of the first aspect, the requested first service belongs to the second service and not to the third service, the PDU session is established by a session management function SMF in the visited network, and the PDU session type is local breakout LBO roaming; or the first service of the request belongs to the third service and does not belong to the second service, the PDU session is established by SMF in the home network, and the PDU session type is home route HR roaming; alternatively, the requested first service belongs to the second service and the third service, the PDU session is established by the SMF in the visited network and/or the SMF in the home network, and the PDU session type is the LBO and/or the HR.

Based on the above scheme, the relation between the first service requested by the terminal device and the second service supported by the visited network and the third service supported by the home network respectively determines whether the PDU session of the terminal device is established by the SMF of the visited network or the SMF of the home network, thereby ensuring the service requirement of the terminal device.

In a second aspect, there is provided a method of accessing a communication network, the method comprising: the method comprises the steps that a second mobile management network element AMF receives second registration request information of terminal equipment, wherein the second registration request information comprises a third service supported by a home network; the second AMF stores the third service locally in the second AMF according to the second registration request message, wherein the second AMF belongs to the home network.

Based on the above scheme, according to the second registration request information of the terminal device, the second AMF stores the third service supported by the home network in the second AMF, and when the first AMF of the visited network queries the third service supported by the home network, the first AMF initiates a query service request information to the second AMF, and the second AMF sends the third service stored in the home network to the first AMF.

With reference to the second aspect, in some implementations of the second aspect, the second AMF receives query service request information sent by the first mobility management network element AMF, where the query service request information is used to query a third service supported by the home network; the second AMF sends service response information to the first AMF, wherein the service response information comprises a third service supported by the home network, and the first AMF belongs to a visited network.

In a third aspect, there is provided a method of accessing a communication network, the method comprising: the data management network element UDM receives second registration request information of the terminal equipment, wherein the second registration request information comprises a third service supported by a home network; the UDM stores the third service locally to the UDM in accordance with the second registration request information, wherein the UDM belongs to the home network.

Based on the above scheme, according to the second registration request information of the terminal device, the UDM stores the third service supported by the home network in the UDM local, and when the first AMF of the visited network queries the third service supported by the home network, the first AMF initiates a query service request information to the UDM, and the UDM sends the third service stored in the local to the first AMF.

With reference to the third aspect, in some implementations of the third aspect, the UDM receives query service request information sent by the first AMF, where the query service request information is used to query a third service supported by the home network; the UDM sends service response information to the first AMF, the service response information including a third service supported by the home network, wherein the first AMF belongs to a visited network.

In a fourth aspect, there is provided a method of accessing a communication network, the method comprising: the terminal device sends second registration request information to a second mobility management network element, wherein the second registration request information comprises a third service supported by a home network, and/or the terminal device sends the second registration request information to a data management network element, and the second mobility management network element and the data management network element belong to the home network.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the method further includes: the terminal equipment sends first information to a first mobile management network element AMF, wherein the first information is used for indicating a first service requested by the terminal equipment; the terminal equipment receives first indication information from the first AMF, wherein the first indication information is used for indicating success or failure of establishment of a protocol data unit PDU session of the terminal equipment, and the first indication information is related to the first service requested, the second service supported by a visiting place network and the third service supported by a home place network; wherein the first AMF belongs to the visited network, and the PDU session is established by a session management function, SMF, network element in the visited network and/or an SMF network element in the home network.

With reference to the fourth aspect, in some implementations of the fourth aspect, the terminal device sends session establishment request information to the first AMF, where the session establishment request information includes service information of the requested first service.

With reference to the fourth aspect, in some implementations of the fourth aspect, the terminal device receives first indication information from the first mobility management network element AMF, where the first indication information is used to indicate that the terminal device PDU session establishment is successful.

With reference to the fourth aspect, in some implementations of the fourth aspect, the requested first service belongs to the second service and not to the third service, the PDU session is established by an SMF in the visited network, and the PDU session type is LBO; or the first service of the request belongs to the third service and does not belong to the second service, the PDU session is established by SMF in the home network, and the PDU session type is HR; alternatively, the requested first service belongs to the second service and the third service, the PDU session is established by the SMF in the visited network and/or the SMF in the home network, and the PDU session type is LBO and/or HR.

With reference to the fourth aspect, in some implementations of the fourth aspect, the terminal device sends first registration request information to the first AMF, where the first registration request information is used to request access to the visited network.

In a fifth aspect, there is provided a method of accessing a communication network, the method comprising: the terminal equipment receives broadcast information from first access network equipment, wherein the broadcast information comprises capability information and access auxiliary information; the terminal equipment determines an access mode of the access network equipment according to the broadcast information, wherein the access mode comprises the following steps: the terminal device accesses to a visiting place network, or the terminal device accesses to a second network through a first network, or the terminal device accesses to the first network through the second network, wherein the first access network device belongs to the visiting place network, the first network is the visiting place network, and the second network is a home place network or a third network different from the visiting place network and the home place network.

Based on the above scheme, the terminal device receives the broadcast information from the first access network device, where the broadcast information includes capability information and access auxiliary information, the capability information is used to instruct the second service supported by the visited network and/or the second service supported only, the access auxiliary information is used to instruct the terminal device to access the second network through the first network or access the first network through the second network, where the first network is the visited network, the second network is the home network or a third network different from the visited network and the home network, and the terminal device selects a suitable mode to access the network device through the access auxiliary information and the capability information in the broadcast information, so that in some specific service networks, the terminal device can access the service supported by the visited network and the service supported by the home network simultaneously, and the service requirement of the terminal device is met.

With reference to the fifth aspect, in some implementations of the fifth aspect, the terminal device sends a third registration request message to a third access network device, where the third registration request message is used to request access to a second network, or the third registration request message is used to request access to the first network, where the third access network device belongs to the first network or the second network.

With reference to the fifth aspect, in certain implementation manners of the fifth aspect, the accessing, by the terminal device, the visited network includes: the terminal device sends first registration request information to a first mobility management network element AMF, where the first registration request information is used to access the visited network, and the first AMF belongs to the visited network.

With reference to the fifth aspect, in certain implementation manners of the fifth aspect, the terminal device receives a registration completion message from the first AMF, where the registration completion message includes second information, and the second information includes updated capability information and/or updated access auxiliary information; and the terminal equipment determines whether to update the access mode according to the second information.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the capability indication information includes at least one of: supportable service identification, supportable service type identification, service provider identification, data network DNN information, and network slicing.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the access assistance information includes at least one of: the network identification of the first network, the network identification of the second network, the address information, the network identification of the N3IWF of the first network device, the network identification of the N3IWF of the second network device, the auxiliary information required by the first network, the auxiliary information required by the second network.

In a sixth aspect, there is provided a method of accessing a communication network, the method comprising: the first access network equipment determines broadcast information; the first access network device sends the broadcast information to the terminal device, where the broadcast information includes capability information and access auxiliary information, the capability information is used to indicate a second service supported by a visited network and/or a second service only supported by the visited network, and the access auxiliary information is used to indicate that the terminal device accesses a second network through a first network or accesses the first network through the second network, where the first network is the visited network, and the second network is the home network or a third network different from the home network and the home network.

Based on the scheme, the first access network equipment determines broadcast information, wherein the broadcast information comprises capability information and access auxiliary information, and after receiving the broadcast information of the first access network equipment, the terminal equipment determines a mode of accessing to the network according to the first service and the broadcast information which are requested, so that the service requirement of the terminal equipment is met.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the access assistance information includes at least one of: the network identification of the first network, the network identification of the second network, the address information, the network identification of the N3IWF of the first network device, the network identification of the N3IWF of the second network device, the auxiliary information required by the first network, the auxiliary information required by the second network.

In a seventh aspect, there is provided a method of accessing a communication network, the method comprising: the method comprises the steps that a first mobile management network element (AMF) receives first registration request information sent by terminal equipment, wherein the first registration request information is used for the terminal equipment to request to register a visiting network; the first AMF sends registration completion information to the terminal equipment, wherein the registration completion information comprises capability information and/or access auxiliary information, and the first AMF belongs to the visiting place network.

With reference to the seventh aspect, in certain implementations of the seventh aspect, the registration completion information further includes updated capability information and/or updated access assistance information.

With reference to the sixth aspect, in some implementations of the sixth aspect, the first AMF sends first request information to the first policy control network element PCF, where the first request information is used to obtain capability information and access auxiliary information; the first AMF receives first response information from the first PCF, the first response information comprising the capability information and the access assistance information, wherein the first PCF belongs to a visited network.

With reference to the seventh aspect, in certain implementations of the seventh aspect, the first AMF receives first response information from the first PCF, including: the first PCF receives third information sent by the second PCF, wherein the third information comprises updated capability information and/or access auxiliary information; the first PCF sends the first response information to the first AMF, where the first response information further includes the updated capability information and/or access assistance information. Wherein the second PCF belongs to the home network.

With reference to the seventh aspect, in certain implementations of the seventh aspect, the capability indication information includes at least one of: supportable service identification, supportable service type identification, service provider identification, data network DNN information, and network slicing.

With reference to the seventh aspect, in certain implementations of the seventh aspect, the access assistance information includes at least one of: the network identification of the first network, the network identification of the second network, the address information, the network identification of the N3IWF of the first network device, the network identification of the N3IWF of the second network device, the auxiliary information required by the first network, the auxiliary information required by the second network.

An eighth aspect provides a communication device for performing the method of any one of the possible implementations of the first to sixth aspects. In particular, the apparatus may comprise means and/or modules, such as a processing unit and/or a communication unit, for performing the method in any of the possible implementations of the first to sixth aspects.

In one implementation, the apparatus is a network device (e.g., a control plane device, such as a mobility management network element, such as a session management network element). When the apparatus is a network device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In another implementation, the apparatus is a chip, a system-on-chip, or a circuit for a network device (e.g., a control plane device, such as a mobility management network element, such as a session management network element). When the apparatus is a chip, a system-on-chip or a circuit for a network device, the communication unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc. on the chip, the system-on-chip or the circuit; the processing unit may be at least one processor, processing circuit or logic circuit, etc.

In a ninth aspect, there is provided a communication apparatus comprising: at least one processor configured to execute a computer program or instructions stored in a memory to perform the method according to any one of the possible implementations of the first to third aspects. Optionally, the apparatus further comprises a memory for storing a computer program or instructions. Optionally, the apparatus further comprises a communication interface through which the processor reads the computer program or instructions stored in the memory.

In one implementation, the apparatus is a network device (e.g., a control plane device, such as a mobility management network element, such as a session management network element).

In another implementation, the apparatus is a chip, a system-on-chip, or a circuit for a network device (e.g., a control plane device, such as a mobility management network element, such as a session management network element).

In a tenth aspect, the present application provides a communication apparatus comprising: the receiving and transmitting unit receives first information sent by the terminal equipment, wherein the first information is used for indicating a first service requested by the terminal equipment; the processing unit determines first indication information according to the first service requested by the terminal equipment, the second service supported by the visiting place network and the third service supported by the home place network, wherein the first indication information is used for indicating success or failure of establishment of a protocol data unit PDU session of the terminal equipment; the transceiver unit transmits the first indication information to the terminal device, wherein the first AMF belongs to the visited network.

With reference to the tenth aspect, in some implementations of the tenth aspect, the transceiver unit receives session establishment request information sent by the terminal device, where the session establishment request information includes a first service requested by the terminal device.

With reference to the tenth aspect, in some implementations of the tenth aspect, the transceiver unit sends query service request information to a second AMF and/or the transceiver unit sends query service request information to a data management network element UDM, where the query service request information is used to query a third service supported by the home network, and the second AMF and the UDM belong to the home network.

With reference to the tenth aspect, in some implementations of the tenth aspect, before the transceiver unit sends the query service request information, the method further includes: the transceiver unit receives first registration request information from the terminal device, the first registration request information being used to request access to the visited network.

With reference to the tenth aspect, in some implementations of the tenth aspect, the transceiver unit receives service response information sent by the second AMF and/or the transceiver unit receives service response information sent by the UDM, where the service response information includes a third service supported by the home network.

With reference to the tenth aspect, in some implementations of the tenth aspect, the transceiver unit sends first indication information to the terminal device, where the first indication information is used to indicate that the PDU session establishment of the terminal device is successful.

With reference to the tenth aspect, in certain implementations of the tenth aspect, the requested first service belongs to the second service and not to the third service, the PDU session is established by a session management function SMF in the visited network, and the PDU session type is local breakout LBO roaming; or the first service of the request belongs to the third service and does not belong to the second service, the PDU session is established by SMF in the home network, and the PDU session type is home route HR roaming; alternatively, the requested first service belongs to the second service and the third service, the PDU session is established by the SMF in the visited network and/or the SMF in the home network, and the PDU session type is the LBO and/or the HR.

In an eleventh aspect, there is provided an apparatus for accessing a communication network, the apparatus comprising: the receiving and transmitting unit receives second registration request information of the terminal equipment, wherein the second registration request information is used for indicating the processing unit to store a third service supported by the home network; the processing unit stores the third service locally in the transceiver unit according to the second registration request information, wherein the transceiver unit and the processing unit belong to the home network.

With reference to the eleventh aspect, in some implementations of the eleventh aspect, the transceiver unit receives query service request information sent by the first mobility management element AMF, where the query service request information is used to query a third service supported by the home network; the transceiver unit sends service response information to the first AMF, the service response information including a third service supported by the home network, wherein the first AMF belongs to a visited network.

In a twelfth aspect, there is provided an apparatus for accessing a communication network, the apparatus comprising: the receiving and transmitting unit receives second registration request information of the terminal equipment, wherein the second registration request information indicates the processing unit to store a third service supported by the home network; the processing unit stores the third service locally to the processing unit according to the second registration request information, wherein the transceiver unit and the processing unit belong to the home network.

With reference to the twelfth aspect, in some implementations of the twelfth aspect, the transceiver unit receives query service request information sent by the first AMF, where the query service request information is used to query a third service supported by the home network; the transceiver unit sends service response information to the first AMF, the service response information including a third service supported by the home network, wherein the first AMF belongs to a visited network.

In a thirteenth aspect, there is provided an apparatus for accessing a communication network, the apparatus comprising: the receiving and transmitting unit receives broadcast information from first access network equipment, wherein the broadcast information comprises capability information and access auxiliary information; the processing unit determines an access mode of the access network equipment according to the broadcast information, wherein the access mode comprises the following steps: the terminal device accesses to a visiting place network, or the terminal device accesses to a second network through a first network, or the terminal device accesses to the first network through the second network, wherein the first access network device belongs to the visiting place network, the first network is the visiting place network, and the second network is a home place network or a third network different from the visiting place network and the home place network.

With reference to the thirteenth aspect, in some implementations of the thirteenth aspect, the transceiver unit sends a third registration request message to a third access network device, where the third access network device belongs to the first network or the second network, and the third registration request message is used to request access to the second network, or the third registration request message is used to request access to the first network.

With reference to the thirteenth aspect, in some implementations of the thirteenth aspect, the transceiver unit accesses the visited network, including: the transceiver unit sends first registration request information to a first mobility management network element AMF, where the first registration request information is used to access the visited network, and the first AMF belongs to the visited network.

With reference to the thirteenth aspect, in certain implementation manners of the thirteenth aspect, the transceiver unit receives a registration completion message from the first AMF, where the registration completion message includes second information, and the second information includes updated capability information and/or updated access assistance information; the processing unit determines whether to update the access mode according to the second information.

With reference to the thirteenth aspect, in certain implementations of the thirteenth aspect, the capability indication information includes at least one of: supportable service identification, supportable service type identification, service provider identification, data network DNN information, and network slicing.

With reference to the thirteenth aspect, in certain implementations of the thirteenth aspect, the access assistance information includes at least one of: the network identification of the first network, the network identification of the second network, the address information, the network identification of the N3IWF of the first network device, the network identification of the N3IWF of the second network device, the auxiliary information required by the first network, the auxiliary information required by the second network.

In a fourteenth aspect, there is provided an apparatus for accessing a communication network, the apparatus comprising: the processing unit determines broadcast information; the receiving and transmitting unit transmits the broadcast information to the terminal device, where the broadcast information includes capability information and access auxiliary information, the capability information is used to indicate a second service supported by a visited network and/or a second service supported only, and the access auxiliary information is used to indicate the terminal device to access a second network through a first network or access the first network through the second network, where the first network is the visited network, and the second network is the home network or a third network different from the visited network and the home network.

With reference to the fourteenth aspect, in certain implementations of the fourteenth aspect, the capability indication information includes at least one of: supportable service identification, supportable service type identification, service provider identification, data network DNN information, and network slicing.

With reference to the fourteenth aspect, in certain implementations of the fourteenth aspect, the access assistance information includes at least one of: the network identification of the first network, the network identification of the second network, the address information, the network identification of the N3IWF of the first network device, the network identification of the N3IWF of the second network device, the auxiliary information required by the first network, the auxiliary information required by the second network.

In a fifteenth aspect, there is provided an apparatus for accessing a communication network, the apparatus comprising: the receiving and transmitting unit receives first registration request information sent by the terminal equipment, wherein the first registration request information is used for the terminal equipment to request to register the visiting network; the transceiver unit sends registration completion information to the terminal device, the registration completion information including capability information and/or access assistance information, wherein the transceiver unit belongs to the visited network.

With reference to the fifteenth aspect, in certain implementations of the fifteenth aspect, the registration completion information further includes updated capability information and/or updated access assistance information.

With reference to the fifteenth aspect, in some implementations of the fifteenth aspect, the transceiver unit sends first request information to the first policy control network element PCF, where the first request information is used to obtain capability information and access auxiliary information; the transceiver unit receives first response information from the first PCF, the first response information including the capability information and the access assistance information, wherein the first PCF belongs to a visited network.

With reference to the fifteenth aspect, in certain implementations of the fifteenth aspect, the transceiver unit receives first response information from the first PCF, including: the receiving and transmitting unit receives third information sent by the second PCF, wherein the third information comprises updated capability information and/or access auxiliary information; the first PCF sends the first response information to the transceiver unit, where the first response information further includes the updated capability information and/or access assistance information. Wherein the second PCF belongs to the home network.

With reference to the fifteenth aspect, in certain implementations of the fifteenth aspect, the capability indication information includes at least one of: supportable service identification, supportable service type identification, service provider identification, data network DNN information, and network slicing.

With reference to the fifteenth aspect, in certain implementations of the fifteenth aspect, the access assistance information includes at least one of: the network identification of the first network, the network identification of the second network, the address information, the network identification of the N3IWF of the first network device, the network identification of the N3IWF of the second network device, the auxiliary information required by the first network, the auxiliary information required by the second network.

In a sixteenth aspect, a computer readable storage medium is provided, the computer readable storage medium storing program code for execution by a device, the program code comprising instructions for performing the method of any one of the possible implementations of the first to seventh aspects described above.

A seventeenth aspect provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the method of any one of the possible implementations of the first to seventh aspects described above.

In an eighteenth aspect, a communication system is provided, the communication system comprising one or more of the first mobility management element, the second mobility management element, and the data management element described above.

In a nineteenth aspect, a communication system is provided, which comprises one or more of the first mobility management element, the first access network device, and the terminal device.

Drawings

Fig. 1 shows a 5G mobile communication system architecture diagram suitable for use in an embodiment of the present application.

Fig. 2 shows a schematic diagram of a system architecture for use with the present application.

Fig. 3 shows a schematic diagram of a non-public network to which embodiments of the application are applied.

Fig. 4 shows a schematic diagram of a system architecture to which the present application is applicable.

Fig. 5 shows a schematic diagram of another system architecture to which the present application is applicable.

Fig. 6 shows a schematic flow chart of a method for accessing a communication network according to an embodiment of the present application.

Fig. 7 shows a schematic flow chart of another method for accessing a communication network according to an embodiment of the present application.

Fig. 8 shows a schematic flow chart of another method for accessing a communication network according to an embodiment of the present application.

Fig. 9 shows a schematic flow chart of another method for accessing a communication network according to an embodiment of the present application.

Fig. 10 shows a schematic flow chart of another method for accessing a communication network according to an embodiment of the present application.

Fig. 11 shows a schematic block diagram of an apparatus for accessing a communication network according to an embodiment of the present application.

Fig. 12 shows a schematic block diagram of another apparatus for accessing a communication network device according to an embodiment of the present application.

Fig. 13 shows a schematic diagram of a chip system according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 1 shows a 5G mobile communication system architecture diagram. As shown, the 5G mobile communication system architecture (radio) access network (radio accessnetwork, (R) AN), core network (Core) and Data Network (DN) are constructed. The UE, the AN and the Core are main components forming the architecture, and can be logically divided into a user plane and a control plane, wherein the control plane is responsible for the management of a mobile network, and the user plane is responsible for the transmission of service data. In the figure, the NG2 reference point is located between the AN control plane and the Core control plane, the NG3 reference point is located between the AN user plane and the Core user plane, and the NG6 reference point is located between the Core user plane and the data network.

UE: the method is an entrance for interaction between the mobile user and the network, can provide basic computing capacity and storage capacity, displays a service window for the user, and accepts user operation input. The UE may establish a signal connection, a data connection, with the AN using a new air interface technology, thereby transmitting control signals and service data to the mobile network.

AN: similar to a base station in a traditional network, the network access function is provided for authorized users in a specific area by being deployed at a position close to the UE, and user data can be transmitted by using transmission tunnels with different qualities according to the level of the users, the service requirements and the like. The AN can manage own resources, reasonably utilize, provide access service for the UE as required, and forward control signals and user data between the UE and the core network.

Core: and the system is responsible for maintaining subscription data of the mobile network, managing network elements of the mobile network, and providing session management, mobility management, policy management, security authentication and other functions for the UE. Providing network access authentication for the UE when the UE is attached; when the UE has a service request, network resources are allocated to the UE; updating network resources for the UE when the UE moves; providing a fast recovery mechanism for the UE when the UE is idle; releasing network resources for the UE when the UE is detached; when the UE has service data, a data routing function is provided for the UE, such as forwarding uplink data to DN; or receiving the downlink data of the UE from the DN and forwarding the downlink data to the AN so as to send the downlink data to the UE.

DN: is a data network for providing business services for users, and generally, a client is located in a UE, and a server is located in the data network. The data network may be a private network, such as a local area network, or an external network not under the control of an operator, such as the Internet, or a proprietary network co-deployed by an operator, such as for configuration of IP multimedia network subsystem (IP multimedia core network subsystem, IMS) services.

Fig. 2 is a detailed architecture determined based on fig. 1, in which a core network control plane adopts a service architecture, and interactions between control plane network elements adopt a service call mode, where the control plane network elements open services to other control plane network elements for the other control plane network elements to call. The following describes each part involved in the network architecture shown in fig. 2:

1. User equipment (terminal) 210: may include various handheld devices, vehicle mount devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of terminals, mobile Stations (MSs), terminals, or soft terminals, etc. Such as water meters, electricity meters, sensors, etc.

Illustratively, the user equipment in the embodiments of the present application may refer to an access terminal, a subscriber unit, a subscriber station, a mobile station, a relay station, a remote terminal, a mobile device, a user terminal (user terminal), a terminal (terminal equipment), a wireless communication device, a user agent, or a user equipment. The user equipment may also be a cellular telephone, cordless telephone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication capability, computing device or other processing device connected to a wireless modem, in-vehicle device, wearable device, user equipment in a 5G network or user equipment in a future evolved public land mobile network (public land mobile network, PLMN), or user equipment in a future internet of vehicles, etc., as the embodiments of the application are not limited in this regard.

As an example and not by way of limitation, in the embodiments of the present application, the wearable device may also be referred to as a wearable intelligent device, which is a generic term for applying wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, apparel, shoes, and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

In addition, in the embodiment of the application, the user equipment can also be user equipment in an internet of things (internet of Things, ioT) system, and the IoT is an important component of the development of future information technology, and the main technical characteristics of the application are that the article is connected with the network through a communication technology, so that the man-machine interconnection and the intelligent network of the internet of things are realized. In the embodiment of the application, the IOT technology can achieve mass connection, deep coverage and terminal power saving through a Narrow Band (NB) technology, for example. In addition, in the embodiment of the application, the user equipment can also comprise sensors such as an intelligent printer, a train detector, a gas station and the like, and the main functions comprise collecting data (part of the user equipment), receiving control information and downlink data of the access network equipment, sending electromagnetic waves and transmitting the uplink data to the access network equipment.

2. (radio) access network device (radio access network, (R) AN) 220: the system is used for providing network access functions for authorized user equipment in a specific area and can use transmission tunnels with different qualities according to the level of the user equipment, the service requirements and the like.

The (R) AN can manage radio resources, provide access services for the ue, and further complete forwarding of control signals and ue data between the ue and the core network.

The access network device in the embodiment of the present application may be any communication device with a wireless transceiver function for communicating with the user equipment. The access network device includes, but is not limited to: an evolved Node B (eNB), a radio network controller (radio network controller, RNC), a Node B (Node B, NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home evolved Node B, heNB, or home Node B, HNB), a Base Band Unit (BBU), an Access Point (AP) in a wireless fidelity (wireless fidelity, WIFI) system, a wireless relay Node, a wireless backhaul Node, a transmission point (transmission point, TP), or a transmission reception point (transmission and reception point, TRP), etc., may also be 5G, such as NR, a gNB in a system, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or may also be a network Node constituting a gNB or a transmission point, such as a distributed unit (BBU), or a distributed unit (BBU), etc.

In some deployments, the gNB may include a Centralized Unit (CU) and DUs. The gNB may also include an active antenna unit (active antenna unit, AAU). The CU implements part of the functionality of the gNB and the DU implements part of the functionality of the gNB. For example, the CU is responsible for handling non-real time protocols and services, implementing the functions of the radio resource control (radio resource control, RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP) layer. The DUs are responsible for handling physical layer protocols and real-time services, implementing the functions of the radio link control (radio link control, RLC), medium access control (media access control, MAC) and Physical (PHY) layers. The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer may eventually become information of the PHY layer or be converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU or by the du+aau. It is understood that the access network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into access network devices in an access network (radio access network, RAN), or may be divided into access network devices in a Core Network (CN), which is not limited by the present application.

3. User plane network element 230: quality of service (quality of service, qoS) handling for packet routing and forwarding, user plane data, etc.

In a 5G communication system, the user plane network element may be a user plane function (user plane function, UPF) network element. In future communication systems, the user plane network element may still be a UPF network element, or may have other names, which is not limited by the present application.

4. Data network element 240: for providing a network for transmitting data.

In the 5G communication system, the data network element may be a Data Network (DN) element. In future communication systems, the data network element may still be a DN network element, or may have other names, which is not limited by the present application.

5. Authentication server 250: a security authentication of the user is performed. In a 5G communication system, the authentication server may be an authentication server function network element (authentication server function, AUSF).

6. Mobility management network element 260: the method is mainly used for mobility management, access management and the like. In a 5G communication system, the access management network element may be an access and mobility management function (access and mobility management function, AMF), mainly performing mobility management, access authentication/authorization, etc. In addition, it is responsible for passing user policies between the terminal and the policy control function (policy control function, PCF) network elements.

7. Session management network element 270: the method is mainly used for session management, network interconnection protocol (internet protocol, IP) address allocation and management of user equipment, terminal node of selecting manageable user plane functions, strategy control and charging function interfaces, downlink data notification and the like.

In the 5G communication system, the session management network element may be a session management function (session management function, SMF) network element, which performs terminal IP address allocation, UPF selection, charging and QoS policy control, and the like.

8. Application network element 280: in the 5G communication system, the application network element may be an application function (application function, AF) network element, which represents an application function of a third party or an operator, and is an interface for the 5G network to obtain external application data, and is mainly used for transferring a requirement of an application side on a network side.

9. Unified data management network element 290: and the management of user identification, subscription data and authentication data is responsible for the registration management of the service network element of the user. In a 5G communication system, the unified data management network element may be a unified data management (unified data management, UDM).

10. Policy control network element 291: the system comprises a user subscription data management function, a policy control function, a charging policy control function, a quality of service (quality of service, qoS) control function and the like, and is used for guiding a unified policy framework of network behaviors and providing policy rule information and the like for control plane function network elements (such as AMF, SMF network elements and the like).

In a 5G communication system, the policy control network element may be a PCF.

11. Network function repository function network element 292: and providing a storage function and a selection function of network function entity information for other core network elements. In a 5G communication system, the network element may be a network function repository function network element (network function repository function, NRF).

12. Network release network element 293: in the 5G communication system, the network element may be a network element with a network opening function (network element function, NEF), which is mainly used for exposing services and capabilities of the 3GPP network function to the AF, and may also enable the AF to provide information to the 3GPP network function.

13. Network slice selection function network element 294: is responsible for selecting a network slice for the UE, which in a 5G communication system may be a network slice selection function (network slice selection function, NSSF) network element.

In future communication systems, such as 6G communication systems, the network element or device may still use its name in the 5G communication system, or may have other names, which are not limited by the embodiments of the present application. The functions of the network element or the device can be completed by one independent network element or can be completed by a plurality of network elements together. In an actual deployment, the network elements in the core network may be deployed on the same or different physical devices. For example, as one possible deployment, the AMF and SMF may be deployed on the same physical device. For another example, the network element of the 5G core network may be deployed on the same physical device as the network element of the 4G core network. The embodiment of the present application is not limited thereto.

In a 5G communication system, the application network element may be an application function (application function, AF) network element. In future communication systems, the application network element may still be an AF network element, or may have other names, which is not limited by the present application.

In the architecture shown in fig. 2, the N1 interface is a reference point between the UE and the AMF; the N2 interface is a reference point of (R) AN and AMF and is used for sending NAS information and the like; the N3 interface is a reference point between (R) AN and UPF, and is used for transmitting data of user plane, etc.; the N4 interface is a reference point between the SMF and the UPF, and is used for transmitting information such as tunnel identification information, data buffer indication information, downlink data notification message, and the like of the N3 connection; the N6 interface is a reference point between the UPF and the DN, and is used for transmitting data of the user plane, etc.

It should be understood that the network architecture applied to the embodiments of the present application is merely illustrative, and the network architecture to which the embodiments of the present application are applied is not limited to this, and any network architecture capable of implementing the functions of the respective network elements described above is applicable to the embodiments of the present application.

Fig. 3 shows a schematic diagram of a non-public network to which embodiments of the application are applied. The Non-public network (NPN) shown in fig. 3 is a Non-public 5G network, and may be divided into a public network integrated NPN (public network integrated NPN) and a stand alone NPN (SNPN) according to whether it depends on the network function of the PLMN. PNI-NPN and SNPN are described in sequence below.

Fig. 3 (1) is PNI-NPN, which may be implemented using network slices in the PLMN, and in order to prevent unauthorized UEs from accessing and selecting PNI-NPN, a closed access group (closed access group, CAG) function may be additionally used. The CAG identifies a set of users that are allowed to access a cell associated with the CAG (CAG cell). In order to prevent a terminal device that is not allowed to access a CAG cell from automatically selecting and accessing the CAG cell, the CAG cell broadcasts one or more CAG IDs, an available CAG list and indication (indicating whether the terminal device is allowed to access only 5GS via the CAG cell) is configured on the terminal device, and UE subscription data on the UDM includes the available CAG list and indication, i.e. the access of the terminal device is restricted by broadcasting the CAG ID and configuring the available CAG ID of the terminal device.

Fig. 3 (2) is an SNPN, which is not dependent on a PLMN network, and is identified by a PLMN id+network identifier (Network identifier, NID), where the PLMN ID may be an intrinsic value reserved for a third party operator, or may be a specific value of a PLMN operator deploying the SNPN. In the SNPN, a cell broadcasts PLMN ID+NID, and terminal equipment selects an accessed NPN according to broadcast information and configured network selection information. If the terminal device finds that the configured network selection information (PLMN id+nid1) is different from the PLMN ID or PLMN id+nid2 broadcasted by the network, the terminal device will not select its access, i.e. let the terminal device correctly select the cell and network by broadcasting PLMN ID and NID.

It should be appreciated that in a 5G communication system, the mobility management element may be an access and mobility management function (access and mobility management function, AMF) element. In future communication systems, the mobility management element may still be an AMF element, or may have other names, which is not limited by the embodiment of the present application.

Fig. 4 is a schematic diagram of a system architecture to which the present application is applicable.

Fig. 4 shows a roaming scenario of local breakout, i.e. network access services of a terminal device through a visited place (visited domain or visited place). The VPLMN is a PLMN network of a visiting domain, the HPLMN is a PLMN network of a home domain (home or home), the security edge protection agent (security edge protection proxy, SEPP) is used as a border gateway between control planes of the core network of operators for user roaming, communication intercommunication is carried out between operators, and message filtering and policy management on a control plane interface between operators are responsible. VSEPP is the SEPP of the visited domain, and HSEPP is the SEPP of the home domain. The network element at the left side of the dotted line is a control plane core network element of the visited domain, the network element at the right side of the dotted line is a control plane core network element of the home domain, and when the terminal device needs to perform authentication through the third party server, the network slice selection authentication and authorization function (nsaaf) network element is responsible for communicating authentication messages with the third party server, and the functions of other core network elements are described in fig. 2 and are not repeated herein.

Roaming scenarios can be divided into Local Break (LBO) roaming and Home Routed (HR) roaming, which differ mainly in whether a session is to be connected to the UPF of the home network. The following briefly describes the two roaming types.

1) HR roaming

In the HR roaming scenario, a session (e.g., PDU session) is connected to the UPF (i.e., H-UPF) of the home network.

By way of example, an HR session (e.g., an HR PDU session) refers to a session established when a user is located in a visited network and connected to an H-UPF, and traffic carried in the HR session is sent from a UE to the H-UPF and then to a receiving end.

2) LBO roaming

In the LBO roaming scenario, a session (e.g., a PDU session) is not connected to the UPF (i.e., H-UPF) of the home network.

By way of example, an LBO session (e.g., an LBO PDU session) refers to a session established when a user is located in a visited network and connected to a V-UPF, and traffic carried in the LBO session is sent directly locally at the visited network (i.e., VPLMN) without wrapping around to the UPF (i.e., H-UPF) of the home network (i.e., HPLMN).

Fig. 5 is a schematic diagram of another system architecture to which the present application is applicable.

Fig. 5 shows a roaming scenario of home routing, i.e. a terminal device accesses a service through a network of a home location (home domain), wherein VPLMN is a PLMN network of a visited domain, HPLMN is a PLMN network of the home domain, VSEPP is SEPP of the visited domain, and HSEPP is SEPP of the home domain. The network element on the left side of the dotted line is the control plane core network element of the visited domain, and the network element on the right side of the dotted line is the control plane core network element of the home domain. The function of the specific core network element is described with reference to fig. 2, and will not be described in detail herein.

It should be understood that the method provided by the embodiment of the present application may be applicable to any of the above scenarios.

The method provided by the embodiment of the application will be described in detail below with reference to the accompanying drawings.

In order to facilitate understanding of the embodiments of the present application, the following description is made:

(1) In various embodiments of the application, where no special description or logic conflict exists, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments based on their inherent logic.

(2) In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. In the text description of the present application, the character "/" generally indicates that the front-rear associated object is an or relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, and c may represent: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c. Wherein a, b and c can be single or multiple respectively.

(3) In the present application, "first" and "second" are merely for convenience of description, and are used for distinguishing objects, not for limiting the scope of the embodiments of the present application. Rather than to describe a sequence or order of features. It is to be understood that the objects so described may be interchanged under appropriate circumstances so as to enable description of aspects other than the embodiments of the application.

In the prior art, when a UE enters the coverage area of the service network, the service network of the specific service provides a network for the specific service (only provides the specific service), and a corresponding access scheme is required to be provided for the UE having only a single radio frequency capability, so that it cannot be ensured that the UE can access the specific PLMN network service and the SNPN network service (e.g. voice, short message) at the same time. The method for accessing the communication network provided by the embodiment of the application is described in detail below with reference to the accompanying drawings, so as to ensure the service requirement of the terminal equipment.

Fig. 6 to 10 illustrate possible processes applicable to the embodiment of the present application. As described above, in order to enable the terminal device to use both the service supported by the visited network and the service supported by the home network, fig. 6 and 7 mainly describe that the visited network determines whether the PDU session initiated by the terminal device is successful or failed according to the first service requested by the terminal device, the second service supported by the visited network, and the third service supported by the home network. In fig. 6, the first AMF acquires a third service supported by the home network through interaction with the second AMF and/or the UDM information, and determines the first indication information according to the first service, the second service and the third service. In fig. 7, before the terminal device initiates a registration request to the visited network, second registration request information is sent to the home network, where the second AMF and/or the UDM store a third service supported by the home network locally in the network element according to the second registration request information of the terminal device. In the method shown in fig. 8, the visited network sends capability indication information and access auxiliary information of its network to the terminal device in the form of broadcast information, and after receiving the broadcast information, the terminal device determines the manner of accessing the network according to the first service information requested by the terminal device. The method shown in fig. 9 is that the terminal device determines a mode of accessing to the network according to the capability indication information and the access auxiliary information in the broadcast information, wherein the access mode includes that the terminal device can access to the first network first and then access to the second network through the first network; or the terminal device may access the second network first and then access the first network through the second network, where the first network belongs to a visited network and the second network belongs to a home network or a third network different from the visited network and the home network. In the method shown in fig. 10, the terminal device sends first registration request information to the access network, when the access network obtains capability information and access auxiliary information of the home network, and when the capability information and the access auxiliary information of the home network are updated, in a registration process of the terminal device, the first PCF interacts with the second PCF to obtain updated capability information and access auxiliary information, so that the terminal device can obtain accurate capability information and access auxiliary information, determine a proper access mode, and meet service requirements of the terminal device.

The communication method described in fig. 2 and 3 in the above embodiment will be described in detail with reference to fig. 6 and 7. Fig. 6 is a schematic flow chart of a method for accessing a communication network according to the present application. The method shown in fig. 6 may include the following steps.

S610, the terminal device sends first information to the first AMF, or the first AMF receives first information from the terminal device, where the first information is used to indicate the first service requested by the terminal device.

It should be understood that the terminal device sends the first information to a first AMF, and the first AMF determines that the PDU session of the terminal device is established successfully or failed according to the first information, where the first AMF belongs to the visited network of the terminal device.

Optionally, the terminal device sends first registration request information to the access network, where the first registration request information includes a first service requested by the terminal device.

Wherein the first service requested by the terminal device includes one or more of: identification of service, identification of service type, identification of provider, data network DNN information, network slicing.

Further, the first AMF receives the first information from the terminal device, and the first AMF initiates a query to the home network of the terminal device for a third service supported by the home network. The method as shown in fig. 6, the method further comprising:

S620, the first AMF sends the query service request information to the second AMF, or the second AMF receives the query service request information sent by the first AMF.

It should be appreciated that the query service request information is used to request service information supported by the home network. Wherein the second AMF belongs to a home network of the terminal device.

It should also be understood that before the terminal device initiates registration with the visited network, the terminal device initiates a registration request with the home network, and the second AFM stores the third service supported by the home network locally at the second AMF network element according to the registration request of the terminal device. For specific steps, please refer to fig. 7, and redundant description is omitted here.

S630, the second AMF sends the service response information to the first AMF, or the first AMF receives the service response information sent from the second AMF.

It should be understood that after the second AMF receives the query service request information, the second AMF sends the locally stored third service to the first AMF according to the request information, i.e. the second AMF sends service response information to the first AMF.

Wherein the service response information includes a third service supported by the home network.

Further, when the service response information sent by the second AMF to the first AMF does not carry the third service supported by the home network, the first AMF sends query service request information to the UDM, and the UDM sends the response information carrying the third service to the first AMF, as shown in fig. 6, where the method further includes:

S640, the first AMF sends the query service request information to the UDM, or the UDM receives the query service request information from the first AMF.

In step S640, similar to step S620, the UDM belongs to the home network to which the terminal device belongs, and in order to avoid redundancy, specific details are described in step S620, which is not repeated here.

Further, the UDM sends service response information to the first AMF according to the query service request information of the first AMF, as shown in the method of fig. 6, and the method further includes:

s650, the UDM sends service response information to the first AMF, or the first AMF receives service response information from the UDM.

It should be understood that, the first AMF sends query service request information to the second AMF, and when the service response information sent by the second AMF includes a third service supported by the home network, the first AMF does not need to send query service request information to the UDM; when the service response information sent by the second AMF does not comprise the third service supported by the home network, the first AMF sends query service request information to the UDM, and the UDM sends the third service write carried in the response information to the first AMF; when the service response information sent by the second AMF includes the third service supported by the home network, the first AMF may also send query service request information to the UDM, which is not limited in the present application.

It should also be appreciated that the first AMF may send the query service request information directly to the UDM, not limited to after step S620.

Further, the first AMF obtains a third service supported by the home network, and determines the first indication information according to the first service requested by the terminal device, the second service supported by the visited network, and the third service supported by the home network, as shown in a method of fig. 6, where the method further includes:

s660, the first AMF sends the first indication information to the terminal device, or the terminal device receives the first indication information sent from the first AMF.

It should be understood that the first indication information is related to a first service requested by the terminal device, a second service supported by the visited network, and a third service supported by the home network, and is used to indicate success or failure of PDU session establishment requested by the terminal device.

It should also be understood that the terminal device determines success or failure of the PDU session establishment of the terminal device according to the first indication information received from the first AMF.

When the first indication information indicates that the PDU session establishment of the terminal equipment is successful.

It should be understood that when the first service requested by the terminal device belongs to the second service supported by the visited network and does not belong to the third service supported by the home network, the first indication information indicates that the terminal device establishes a PDU session successfully, and the terminal device establishes an LBO session to connect to the first access network device, where the PDU session is established by an SMF network element in the first access network device.

It should also be understood that when the first service requested by the terminal device belongs to the third service supported by the home network and not to the second service supported by the visited network, the first indication information indicates that the terminal device PDU session establishment is successful, the terminal device establishes an HR session to connect the first access network device and the second access network device, where the AMF of the first access network device establishes the PDU session, and then the connection is optionally established by the SMF network element in the second access network device.

It should also be understood that when the first service requested by the terminal device belongs to the second service supported by the visited network and the third service supported by the home network, the first indication information indicates that the PDU session establishment of the terminal device is successful, and the terminal device establishes the LBO session or HR session.

When the first indication information indicates that the PDU session establishment of the terminal equipment fails.

It should be understood that the first service requested by the terminal device does not belong to the second service supported by the visited network and does not belong to the third service supported by the home network, and the first indication information indicates that the PDU session establishment of the terminal device fails.

Further, the first AMF sends query service request information to the second AMF and/or the UDM, where the second AMF and/or the UDM stores third service information supported by the home network in the local network according to the registration request information sent by the terminal device to the home network.

The specific method of storing the third service information supported by the home network in the home network by the second AMF and/or UDM referred to in fig. 6 of the above embodiment will be described in detail with reference to the method shown in fig. 7 of the specific embodiment. As shown in fig. 7, the method may include:

s710, the second AMF receives the second registration request information from the terminal device.

The terminal equipment sends second registration request information to the home network, and the second AMF receives the second registration request information from the terminal equipment.

It should be understood that the second AMF receives the second registration request information from the terminal device, and the second AMF stores the third service supported by the home network locally in the second AMF according to the second registration request information.

S720, the UDM receives the second registration request information from the terminal device.

And storing a third service supported by the home network in the UDM local according to the second registration request information by the UDM, wherein the UDM belongs to the home network.

Further, the second AMF and/or UDM receives the second registration request information from the terminal device, and stores a third service supported by the home network locally in the network element, as shown in fig. 7, and the method further includes:

And S730, the second AMF and/or the UDM stores the third service supported by the home network locally according to the second registration request information.

Optionally, the third service comprises one or more of an identification of the service, an identification of the service category, a provider identification, data network DNN information, network slicing.

It should be understood that, when the second AMF and/or the UDM store the third service supported by the home network locally and the first AMF obtains the third service supported by the home network, the second AMF and/or the UDM may send the third service supported by the home network to the first AMF by initiating a query service request to the second AMF and/or the UDM, where the second AMF and/or the UDM carries the third service supported by the home network in service response information, so that the first AMF determines the first indication information.

The communication method shown in fig. 2 and fig. 3 of the foregoing embodiments will be described in detail with reference to fig. 8 and fig. 9 of the particular embodiments, where the visited network sends capability indication information and access auxiliary information of its network to the terminal device in the form of broadcast information, and after the terminal device receives the broadcast information, determines the manner of accessing the network according to the first service information requested by the terminal device. As shown in fig. 8, the present application provides a flowchart of a method for accessing a communication network. The method may include the following steps.

S801, the terminal device receives broadcast information from the visited network, or the visited network transmits broadcast information to the terminal device.

It should be understood that the first access network device belongs to the visited network, and the broadcast information may be sent by the first access network device, or may be acquired by the terminal device.

It should also be understood that the broadcast information includes capability information of the visited network and access assistance information for indicating a second service supported by the visited network and/or a second service supported only, and the access assistance information is for indicating that the terminal device accesses the second network through the first network or that the terminal device accesses the first network through the second network, wherein the first network belongs to the visited network, the second network belongs to the home network or a third network different from the visited network or the home network.

It should also be understood that after the terminal device roams to the visited network, the terminal device acquires capability information and access assistance information of the visited network through broadcast information of the visited system. And the terminal equipment selects a proper access mode to access the network according to the first service requirement.

Optionally, the capability information includes one or more of: supportable service identification, supportable service type identification, service provider identification, data network DNN information, and network slicing.

Optionally, the access assistance information includes one or more of: network identification information of the first network, network identification information of the second network, address information, network identification of an N3IWF (Non-3 GPP Inter Working Function) of the first network device, network identification of an N3IWF (Non-3 GPP Inter Working Function) of the second network device, auxiliary information required by the first network, and auxiliary information required by the second network.

Optionally, the terminal device initiates a registration procedure to the access network, through which the capability information and the access auxiliary information of the access network can be obtained, and the form of the capability information and the access auxiliary information of the access network obtained by the terminal device is various (such as pre-configuration or protocol regulation), which is not limited in the present application.

Further, after receiving the related information broadcast by the access network, the terminal device selects a mode of accessing the access network according to the first service requested, and the method shown in fig. 8 further includes:

s802, the terminal equipment determines an access mode.

It should be understood that, when the broadcast information of the visited network indicates that only the service capability of the home network is unlimited, the terminal device directly accesses the visited network, or the terminal device directly accesses the first access network device.

It should also be understood that, when the broadcast information of the visited network indicates that only the service capability indication of the home network is limited, the terminal device considers that the visited network can only provide the service in the service capability indication of the visited network, where when the first service requested by the terminal device belongs to the service in the service capability indication of the visited network, the terminal device directly accesses the visited network; when the first service requested by the terminal equipment is in the visiting network supporting service beyond the service indication, the terminal equipment accesses the network equipment according to the received access auxiliary information.

In the method for the terminal device to access the network device according to the access assistance information, please refer to the method shown in fig. 9 specifically, and in order to avoid redundancy, details are omitted here.

According to the method shown in fig. 8, after the terminal device acquires the capability information and the access auxiliary information, the terminal device selects an access method according to the received capability information and the access auxiliary information, and the method shown in fig. 9 specifically describes the manner in which the terminal device accesses the network. Fig. 9 is a schematic flow chart of another method for accessing a communication network according to an embodiment of the present application. The method may include the following steps.

Mode A

The terminal device accesses the second network through the first network according to the access auxiliary information.

And SA901, the terminal equipment accesses the first network according to the access auxiliary information.

The terminal equipment accesses the first network according to the access auxiliary information.

And SA902, the terminal equipment accesses to a second network through the first network.

The terminal equipment accesses the second network through the first network, and the first service requested by the terminal equipment is met.

Wherein the first network is a visited network and the second network is a home network or a third network different from the visited network and the home network.

For example, the terminal roams to a visited network, which can only provide a specific local service, but cannot provide other services than the local service; at this time, the terminal needs to access the specific service provided by the visited network and other services except the specific service provided by the visited network according to the service requirement, and can select an access mode of accessing the home network through the visited network by using the network access auxiliary information of the home network provided by the visited network, and simultaneously access the visited network and the home network, thereby simultaneously obtaining the services provided by the visited network and the home network.

Mode B

The terminal device accesses the first network through the second network according to the access auxiliary information.

SB901, the terminal equipment accesses the second network according to the access auxiliary information.

SB902, the terminal device accesses the first network through the second network.

It should be understood that the terminal device accesses the second network according to the access assistance information and then accesses the first network through the second network.

For example, the terminal roams to a visited network, which can only provide a specific local service, but cannot provide other services than the local service; at this time, the terminal needs to access the specific service provided by the visited network and other services except the specific service provided by the visited network according to the service requirement, and the terminal can select an access mode of accessing the visited network through other target networks by using the network access auxiliary information of other target networks provided by the visited network, and simultaneously access the visited network and other target networks, thereby simultaneously obtaining the services provided by the visited network and other target networks.

The method shown in fig. 9, the terminal device may select a suitable access mode to access the visited network according to the capability information and the access auxiliary information in the broadcast information of the visited network, and the terminal device combines the first service requested by the terminal device, so that the terminal device may access the specific network service and the public network service of the visited network at the same time.

When the terminal equipment is accessed to the access network specific network service and the public network service simultaneously, if the first service requested by the terminal equipment is changed, the terminal equipment selects whether the access network is required to be continuously accessed according to the new first service, or the terminal equipment is accessed to the second network through the access network to meet the self service requirement of the terminal equipment.

The manner how the terminal device selects the access network according to the acquired capability information and the access auxiliary information is specifically described in fig. 8 and fig. 9, and the manner in which the terminal device determines whether to update the access network according to the first service requested by the terminal device when the capability information and the access auxiliary information of the network are updated is specifically described in conjunction with fig. 10. As shown in the method of fig. 10, the method may include the following steps.

S1001, the terminal device sends the first registration request information to the access network, or the access network receives the first registration request information from the terminal device.

It should be understood that, when the terminal device obtains the capability information and the access auxiliary information of the access network through the first registration request information and the capability information and the access auxiliary information are configured in the AMF of the visited network, the first access network device sends the first registration request information to the first AMF, as shown in the method of fig. 10, and the method further includes:

s1002, the first access network device of the visited network sends first registration request information of the terminal device to a first AMF network element belonging to the visited network.

It should be appreciated that the first AMF network element obtains the capability indication and access assistance information of the visited network from a first PCF network element, wherein the first PCF belongs to the visited network.

Further, the first AMF sends first request information to the first PCF, as in the method shown in fig. 10, and the method further comprises:

s1003, the first AMF network element sends first request information to the network element belonging to the first PCF, or the first PCF network element receives the first request information sent by the first AMF network element.

The first request information is used for acquiring capability indication information and access auxiliary information of the visited network.

It should be understood that the first PCF receives the first request information, and sends the capability indication information and the access assistance information to the first AMF network element according to the first request information.

Optionally, the first AMF obtains the updated capability information and the access auxiliary information of the home network from the second PCF network element belonging to the home network through a terminal policy UE Policy Association sub-flow in the registration flow of the terminal device.

Further, the first PCF receives third information sent from the second PCF, as in the method shown in fig. 10, the method further comprises:

s1004, the first PCF network element receives the third information sent by the second PCF network element, or the second PCF network element sends the third information to the first PCF.

It is understood that the third information includes updated capability information of the home network and access assistance information.

It should also be understood that the capability information and the access auxiliary information of the home network are changed, and information interaction is performed between the home network and the visited network through the PCF network element, so as to update the relevant information to the terminal device.

After the first PCF receives the third information sent by the second PCF network element, the first PCF sends second response information to the second PCF, as shown in the method of fig. 10, and the method further includes:

s1005, the first PCF sends the second response information to the second PCF, or the second PCF receives the second response information sent from the first PCF.

The second response information indicates that the first PCF receives response information of third information sent by the second PCF.

Further, the first PCF sends the first response information to the first AMF, as in the method shown in fig. 10, and the method further comprises:

s1006, the first PCF network element sends first response information to the first AMF network element, or the first AMF receives the first response information sent by the first PCF.

It should be understood that the capability information and the access assistance information of the home network are updated, and the first response information includes the capability information and the access assistance information of the visited network and the updated capability information and the access assistance information of the home network; the capability information and the access assistance information of the home network are not updated, and the first response information includes the capability information and the access assistance information of the visited network.

Further, the first AMF network element receives the first response information sent by the first PCF, and sends registration completion information to the terminal device, as shown in the method of fig. 10, where the method further includes:

s1007, the first AMF network element sends the registration completion information to the terminal device, or the terminal device receives the registration completion information sent from the first AMF network element.

It should be understood that the registration completion information includes capability information of the network and access assistance information.

Wherein the registration completion information includes capability information and access assistance information of the visited network, or the registration completion information includes capability information and access assistance information of the visited network and updated capability information and access assistance information of the home network.

Further, the terminal device receives the registration completion information sent from the first AMF network element, and determines whether to update the access mode, as in the method shown in fig. 10, where the method further includes:

s1008, the terminal equipment determines whether to update the access mode.

It should be understood that, when the terminal device receives the registration completion information, the terminal device selects to continue to reside in the access network according to the first service requirement of the request, or selects other access modes to access the access network according to the first service requirement of the request, where the specific access modes are as shown in the method shown in fig. 9 and are not repeated herein to avoid redundancy.

The method for accessing the communication network according to the embodiment of the present application is described in detail above with reference to fig. 6 to 10, and the apparatus for accessing the communication network according to the embodiment of the present application is described in detail below with reference to fig. 11 to 13.

The following describes in detail the device for accessing a communication network according to the embodiment of the present application in fig. 11 to 13. It should be understood that the descriptions of the apparatus embodiments and the descriptions of the method embodiments correspond to each other, and thus, descriptions of details not shown may be referred to the above method embodiments, and for the sake of brevity, some parts of the descriptions are omitted.

Fig. 11 is a schematic block diagram of an apparatus for accessing a communication network according to an embodiment of the present application. The apparatus 1100 includes a transceiving unit 1110 and a processing unit 1120. The transceiving unit 1110 may be used to implement a corresponding communication function. The transceiver unit 1110 may also be referred to as a communication interface or a communication unit. The processing unit 1120 may be adapted to implement corresponding processing functions.

Optionally, the apparatus 1100 further includes a storage unit, where the storage unit may be configured to store instructions and/or data, and the processing unit 1120 may read the instructions and/or data in the storage unit, so that the apparatus implements the actions of the device or network element in the foregoing method embodiments.

The apparatus 1100 may be configured to perform the actions performed by the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the above method embodiments, where the apparatus 1100 may be the first AMF, the second AMF, the UDM, or a component of the first AMF, the second AMF, the UDM, the first access network device, or the terminal device, the transceiver unit 1110 is configured to perform operations related to transceiving of the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the above method embodiments, and the processor unit 1120 is configured to perform operations related to processing of the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the above method embodiments.

It should also be appreciated that the apparatus 1100 herein is embodied in the form of functional units. The term "unit" herein may refer to an application specific integrated circuit (application specific integrated circuit, ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor, etc.) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an alternative example, it will be understood by those skilled in the art that the apparatus 1100 may be specifically configured to perform each flow and/or step corresponding to the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the foregoing embodiments of the methods, or the apparatus 1100 may be specifically configured to perform each flow and/or step corresponding to the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the foregoing embodiments of the methods, which are not repeated herein.

The apparatus 1100 of each of the above embodiments has a function of implementing the corresponding step performed by the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the above method, or the apparatus 1100 of each of the above embodiments has a function of implementing the corresponding step performed by the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the above method. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions; for example, the transceiver unit may be replaced by a transceiver (e.g., a transmitting unit in the transceiver unit may be replaced by a transmitter, a receiving unit in the transceiver unit may be replaced by a receiver), and other units, such as a processing unit, etc., may be replaced by a processor, to perform the transceiver operations and related processing operations in the various method embodiments, respectively.

The transceiver 1110 may be a transceiver circuit (e.g., may include a receiving circuit and a transmitting circuit), and the processing unit may be a processing circuit.

It should be noted that the apparatus in fig. 11 may be a network element or a device in the foregoing embodiment, or may be a chip or a chip system, for example: system on chip (SoC). The receiving and transmitting unit can be an input and output circuit and a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit on the chip. And are not limited herein.

As shown in fig. 12, an embodiment of the present application provides another communication apparatus 1200. The apparatus 1200 includes a processor 1210, the processor 1210 being coupled to a memory 1220, the memory 1220 being for storing computer programs or instructions and/or data, the processor 1210 being for executing the computer programs or instructions stored by the memory 1220 or for reading data stored by the memory 1220 for performing the methods in the method embodiments above.

Optionally, the processor 1210 is one or more.

Optionally, the memory 1220 is one or more.

Alternatively, the memory 1220 may be integrated with the processor 1210 or may be separate.

Optionally, as shown in fig. 12, the apparatus 1200 further comprises a transceiver 1230, the transceiver 1230 being configured to receive and/or transmit signals. For example, the processor 1210 may be configured to control the transceiver 1230 to receive and/or transmit signals.

As an aspect, the apparatus 1200 is configured to implement the operations performed by the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the above method embodiments.

For example, the processor 1210 is configured to execute computer programs or instructions stored in the memory 1220 to implement the operations associated with the first control plane device in the above respective method embodiments. For example, the first AMF in any one of the embodiments shown in fig. 6 or fig. 7, or the method of the first AMF in any one of the embodiments shown in fig. 6 or fig. 7.

It should be appreciated that the processors referred to in embodiments of the present application may be central processing units (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), off-the-shelf programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be understood that the memory referred to in embodiments of the present application may be volatile memory and/or nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM). For example, RAM may be used as an external cache. By way of example, and not limitation, RAM includes the following forms: static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM).

It should be noted that when the processor is a general purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, the memory (storage module) may be integrated into the processor.

It should also be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Referring to fig. 13, an embodiment of the present application provides a chip system 1300. The system-on-chip 800 (or may also be referred to as a processing system) includes logic 1310 and input/output interfaces 1320.

Logic 1310 may be a processing circuit in system-on-chip 1300. Logic 1310 may be coupled to the memory unit to invoke instructions in the memory unit so that system-on-chip 1300 can implement the methods and functions of embodiments of the present application. The input/output interface 1320 may be an input/output circuit in the chip system 1300, outputting information processed by the chip system 1300, or inputting data or signaling information to be processed into the chip system 1300 for processing.

As an aspect, the chip system 1300 is configured to implement the operations performed by the first AMF, the second AMF, the UDM, the first access network device, or the terminal device in the above method embodiments.

For example, the logic 1310 is configured to implement operations related to processing by the first AMF in the above method embodiments, such as operations related to transmission and/or reception by the first AMF in the method embodiments of fig. 6 to 10, such as operations related to transmission and/or reception performed by the first AMF in any one of the embodiments shown in fig. 6 to 10. .

The embodiments of the present application further provide a computer readable storage medium having stored thereon computer instructions for implementing the method performed by the network element in the above method embodiments.

For example, the computer program when executed by a computer, enables the computer to implement the method performed by the user plane network element in the embodiments of the method described above.

As another example, the computer program when executed by a computer may enable the computer to implement the method performed by the session management network element in the embodiments of the method described above.

As another example, the computer program when executed by a computer may enable the computer to implement the method performed by the edge application server discovery network element in the embodiments of the method described above.

The embodiment of the application also provides a computer program product, which contains instructions, and the instructions are executed by a computer to realize the method executed by the network element in each method embodiment.

The embodiment of the application also provides a communication system which comprises one or more of the user plane network element, the session management network element and the edge application server discovery network element.

The explanation and beneficial effects of the related content in any of the above-mentioned devices can refer to the corresponding method embodiments provided above, and are not repeated here.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Furthermore, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of accessing a communication network, comprising:

the method comprises the steps that a first mobile management network element receives first information sent by terminal equipment, wherein the first information is used for indicating a first service requested by the terminal equipment;

the first mobility management network element determines first indication information according to a first service requested by the terminal equipment, a second service supported by a visiting place network and a third service supported by a home network, wherein the first indication information is used for indicating success or failure of establishment of a protocol data unit session of the terminal equipment;

said first mobility management network element F sends said first indication information to said terminal device,

wherein the first mobility management element belongs to the visited network.

2. The method according to claim 1, wherein the method further comprises:

the first mobility management network element receives session establishment request information sent by a terminal device, wherein the session establishment request information comprises a first service requested by the terminal device.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

the first mobility management network element sends query service request information to the second mobility management network element and/or the first mobility management network element sends query service request information to the data management network element, the query service request information is used for querying a third service supported by the home network,

Wherein the second mobility management network element and the data management network belong to the home network.

4. A method according to claim 3, wherein before the first mobility management element sends the query service request information, the method further comprises:

the first mobility management network element receives first registration request information from the terminal device, where the first registration request information is used to request access to the visited network.

5. The method according to claim 3 or 4, characterized in that the method further comprises:

the first mobility management network element receives the service response information sent by the second mobility management network element and/or the first mobility management network element receives the service response information sent by the data management network,

6. The method according to any one of claims 1 to 5, wherein the first indication information is used for indicating success or failure of a protocol data unit session establishment of the terminal device, and comprises:

the first mobility management network element F sends first indication information to the terminal equipment, wherein the first indication information is used for indicating that the protocol data unit session of the terminal equipment is successfully established.

7. The method of claim 6, wherein the requested first service belongs to the second service and not to the third service,

the protocol data unit session is established by a session management function in the visited network, and the protocol data unit session type is local break-through roaming; or alternatively, the process may be performed,

the requested first service belongs to the third service, and does not belong to the second service,

the protocol data unit session is established by a session management function in the home network, and the protocol data unit session type is home route roaming; or alternatively, the process may be performed,

the requested first service belongs to the second service and the third service,

the PDU session is established by a session management function in the visitor network and/or a session management function in the home network, the protocol data unit session type being the local breakout roaming and/or the home routing roaming.

8. A method of accessing a communication network, comprising:

the second mobility management network element receives second registration request information of the terminal equipment, wherein the second registration request information comprises a third service supported by a home network;

The second mobility management network element stores the third service locally to the second mobility management network element according to the second registration request information,

wherein the second mobility management element belongs to the home network.

9. The method of claim 8, wherein the method further comprises:

the second mobility management network element receives query service request information sent by the first mobility management network element, wherein the query service request information is used for querying a third service supported by the home network;

the second mobility management network element sends service response information to the first mobility management network element, the service response information including a third service supported by the home network,

wherein the first mobility management element belongs to a visited network.

10. A method of accessing a communication network, comprising:

the data management network element receives second registration request information of the terminal equipment, wherein the second registration request information comprises a third service supported by a home network;

the data management network element stores the third service locally to the data management network element according to the second registration request information,

Wherein the data management network element belongs to the home network.

11. The method according to claim 10, wherein the method further comprises:

the data management network element receives inquiry service request information sent by a first mobile management network element, wherein the inquiry service request information is used for inquiring a third service supported by the home network;

the data management network element sends service response information to the first mobility management network element, the service response information including a third service supported by the home network,

wherein the first mobility management element belongs to a visited network.

12. A method of accessing a communication network, comprising:

the method comprises the steps that terminal equipment receives broadcast information from first access network equipment, wherein the broadcast information comprises capability information and access auxiliary information;

the terminal equipment determines an access mode of the access network equipment according to the broadcast information, wherein the access mode comprises the following steps: the terminal device accesses a visiting ground network, or the terminal device accesses a second network through a first network, or the terminal device accesses the first network through the second network,

Wherein the first access network device belongs to the visited network, the first network is the visited network, and the second network is a home network or a third network different from the visited network and the home network.

13. The method of claim 12, wherein the terminal device accesses the second network through the first network or the terminal device accesses the first network through the second network, comprising:

the terminal device sends a third registration request message to a third access network device, where the third registration request message is used to request access to a second network, or,

the third registration request message is for requesting access to the first network,

wherein the third access network device belongs to the first network or the second network.

14. The method of claim 12, wherein the terminal device accesses the visited network, comprising:

the terminal device sends first registration request information to a first mobility management network element, the first registration request information being used for accessing the visited network,

wherein the first mobility management element belongs to the visited network.

15. The method of claim 14, wherein the method further comprises:

the terminal equipment receives a registration completion message from the first mobile management network element, wherein the registration completion message comprises second information, and the second information comprises updated capability information and/or updated access auxiliary information;

and the terminal equipment determines whether to update the access mode according to the second information.

16. The method according to any one of claims 12 to 15, wherein the capability indication information comprises at least one of:

supportable service identification, supportable service type identification, service provider identification, data network information, and network slicing.

17. The method according to any of claims 12 to 16, wherein the access assistance information comprises at least one of:

the network identification of the first network, the network identification of the second network, the address information, the network identification of the non-third generation partnership project interworking function of the first network device, the network identification of the non-third generation partnership project interworking function of the second network device, the auxiliary information required by the first network, and the auxiliary information required by the second network.

18. A method of accessing a communication network, comprising:

the first access network equipment determines broadcast information;

the first access network device sends the broadcast information to the terminal device, the broadcast information comprises capability information and access auxiliary information, the capability information is used for indicating a second service supported by an access network and/or a second service only supported by the access network, the access auxiliary information is used for indicating the terminal device to access a second network through a first network or access the first network through the second network,

wherein the first network is the visited network and the second network is the home network or a third network different from the visited network and the home network.

19. The method of claim 18, wherein the capability indication information comprises at least one of:

supportable service identification, supportable service type identification, service provider identification, data network DNN information, and network slicing.

20. The method according to claim 18 or 19, wherein the access assistance information comprises at least one of:

21. A method of accessing a communication network, comprising:

the method comprises the steps that a first mobile management network element receives first registration request information sent by terminal equipment, wherein the first registration request information is used for the terminal equipment to request to register a visiting network;

the first mobility management network element sends registration completion information to the terminal device, the registration completion information comprising capability information and/or access assistance information,

wherein the first mobility management element belongs to the visited network.

22. The method according to claim 21, wherein the registration completion information further comprises updated capability information and/or updated access assistance information.

23. The method according to claim 21 or 22, characterized in that the method further comprises:

the first mobility management network element sends first request information to a first policy control network element, wherein the first request information is used for acquiring capability information and access auxiliary information;

the first mobility management network element receives first response information from the first policy control network element, the first response information comprising the capability information and the access assistance information,

Wherein the first PCF belongs to a visited network.

24. The method of claim 23, wherein the first mobility management element receiving the first response information from the first policy control element comprises:

the first policy control network element receives third information sent by the second policy control network element, wherein the third information comprises updated capability information and/or access auxiliary information;

the first policy control network element sends the first response information to the first mobility management network element, the first response information further comprising the updated capability information and/or access assistance information,

wherein the second policy control network element belongs to a home network.

25. The method according to any one of claims 21 to 24, wherein the capability indication information is at least one of:

26. The method according to any of claims 21 to 25, wherein the access assistance information comprises at least one of:

27. A communication device, comprising:

a processor for executing a computer program stored in a memory to cause the apparatus to perform the method of any one of claims 1 to 26.

28. The apparatus of claim 27, further comprising the memory.

29. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when run on a computer, causes the computer to perform the method according to any of claims 1 to 26.

30. A computer program product, characterized in that the computer program product comprises instructions for performing the method of any one of claims 1 to 26.